Many changes all around. Started main menu.

Added Drawable, Sprite and SoundEffect classes.
Added comments to Fader class.

src/gstates/gstate.lua

@@ -3,13 +3,13 @@
 ------------------------------------------------------------------------------
 
 local make_class = require 'src.utils.classes'
-
+local Drawable   = require 'src.ui.drawable'
 
 ------------------------------------------------------------------------------
 -- Class definitions
 ------------------------------------------------------------------------------
 
-local GameState = make_class()
+local GameState = make_class(Drawable)
 
 
 ------------------------------------------------------------------------------
@@ -17,13 +17,9 @@ local GameState = make_class()
 ------------------------------------------------------------------------------
 
 function GameState:_init(name, index)
+    Drawable._init(self)
     self.name  = name
     self.index = index
-    self.valid = false
-end
-
-
-function GameState:load()
 end
 
 
@@ -32,37 +28,6 @@ function GameState:update(_)
 end
 
 
-function GameState:draw()
-end
-
-
-function GameState:unload()
-end
-
-
-function GameState:keypressed(_, _ , _)
-end
-
-
-function GameState:textinput(_)
-end
-
-
-function GameState:keyreleased(_, _)
-end
-
-
-function GameState:mousemoved(_, _, _, _)
-end
-
-
-function GameState:mousepressed(_, _, _)
-end
-
-
-function GameState:mousereleased(_, _, _)
-end
-
 ------------------------------------------------------------------------------
 -- Module return
 ------------------------------------------------------------------------------